The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b284829a639691cc7e2513c2194ce3164b4354cd

commit b284829a639691cc7e2513c2194ce3164b4354cd
Author: Alexander Alekseev <alemate@chromium.org>
Date: Fri Dec 14 00:54:36 2018

Chrome OS tests: Generalize JsConditionWaiter.

This Cl replaces JsConditionWaiter with more general TestConditionWaiter,
and removes some code duplication.

Bug: 880803
Change-Id: Iaa43837542305c1a7ed0ec0c5c761d7818db9d65
Reviewed-on: https://chromium-review.googlesource.com/c/1375713
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616532}
[modify] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/BUILD.gn
[modify] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/login/demo_mode/demo_setup_browsertest.cc
[modify] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/login/kiosk_browsertest.cc
[modify] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/login/oobe_interactive_ui_test.cc
[modify] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/login/sync_consent_interactive_ui_test.cc
[add] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/login/test/test_condition_waiter.cc
[add] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/browser/chromeos/login/test/test_condition_waiter.h
[modify] https://crrev.com/b284829a639691cc7e2513c2194ce3164b4354cd/chrome/test/BUILD.gn